PUMP

FIELD: engines and pumps.SUBSTANCE: invention relates to pump engineering, particularly, to pumps with start / stop devices. Pump comprises impellers forming, with sealing rings, radial clearances δ, unloading disc with hub forming with fixed ring (5) installed in pump cover, radial clearance δ, sliding bearing including housing, on which cover (8) with ring (9) attached to it is installed. Trunnion of bearing is installed on shaft and made composite along length. First part of the trunnion, which is located on the side of the unloading disc, has smaller diameter than the second part of the trunnion, located on the side of the free end of the shaft and having an end collar. First part (10) of trunnion and first bushing (13) installed on body have radial clearance δ. Second journal part (11) having larger diameter and second bushing (14) installed on bearing housing have radial clearance δand form sliding bearing. Gaps are interrelated by relationships: δ